Process for preparing [5-amino-2-(2-hydroxyethylamino)-phenyl](2-hydroxyethyl)sulphone

摘要

A process for preparing the sulphone of the formula <IMAGE> (1) consists in reductive cleavage of disazo/disazoxy dyestuffs of the formula <IMAGE> +TR <IMAGE> in which B is a direct bond or a bridging member and v, w, x, y, independently of one another, are 0 or 1, x+y being 0 or 1 and v+w being 0 or 1.